3kW can get you a hot bath in an hour. 1kW is far above standing losses so 1kW wouldn't take a lot longer than 3hrs to get there.
It's mostly instantaneous... but if someone else has just used the lot, it becomes instantaneously very slow.
NT
Filling Bath using instantaneous Electric Water Heater
Aug 28, 2020
Last reply: 5 years ago
23 Replies
Instant heating can run while the cylinder fills the bath. It gets you 2 hot supplies at once, one stored & one via the cold tap. Result: more hot water available. But it's moot, just turn the temp up a little.
NT
If you can fill a bath using only 60 - 70 L of hot water!
See above
I'm more used to a 4" bath, though I've not had a bath in a long time :) 60l can do more than that. The hotter your HW cylinder the deeper you can have. Add instant heat & you get more.
Of course there is a way you can have as much as hot as you like:
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I definitely don't recommend it. Seen setups like that in the developing world. A single error = death.
NT
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